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Methd for on-line monitoring coke burning-off process

A monitoring equipment, gas flow meter technology, applied in the petroleum industry, cracking, non-catalytic thermal cracking and other directions, can solve the problems affecting the comprehensive benefits of ethylene plants, and the efficiency of cracking furnaces cannot be optimally utilized, and achieves easy automatic operation, The effect of reducing energy consumption and energy consumption

Inactive Publication Date: 2006-11-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the coke cleaning process cannot be effectively regulated to achieve thorough coke cleaning, the efficiency of the cracking furnace in the ethylene plant will not be fully utilized, thus affecting the overall benefits of the entire ethylene plant

Method used

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  • Methd for on-line monitoring coke burning-off process
  • Methd for on-line monitoring coke burning-off process
  • Methd for on-line monitoring coke burning-off process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The cracking raw material is naphtha B, the distillation range is 45-180°C, and the specific gravity is D 15.6 0.7044g / ml, sulfur content 136PPM. The device is a 60,000 tons / year ethylene SRT-IV industrial cracking furnace. There are three groups of tubes A, B and C connected in parallel and three quench boilers. The inlet temperature of the cracking furnace tube is 520°C and the outlet temperature is 820°C. A certain amount of anti-scorch agent was added to the pyrolysis furnace tubes of Group B. After 45 days of operation, it entered the program burning stage. The BASF method was used to control the burning process and online burning. The whole program took 72 hours, of which the furnace tube part accounted for 42.5 Hour. Adopt the method of the present invention, on each group of quenching boiler outlet pipe that links to each other with the cracking furnace, open a lead-out hole that inner diameter is 12mm, the gas collection pipe links to each other with the coil...

Embodiment 2

[0046] Adopt the same industrial device (60,000 tons / year ethylene SRT-IV type industrial cracking furnace) as in Example 1.

[0047] The cracking raw material is heavy light diesel oil B, the distillation range is 230-465°C, and the specific gravity is D 15.6 0.8400g / ml, sulfur content 370PPM, furnace tube inlet temperature 490°C, outlet temperature 790°C, after 43 days of operation, it enters the scorch stage, according to the coke measuring method in Example 1, the scorch control curves LBa-ac and LBa-b are obtained (see attached image 3 ). The results show that after 12.5 hours of burning operation, the next stage of burning procedure can be started, saving about 30 hours of time.

Embodiment 3

[0049] Cracking raw material is hydrogenated tail oil C, distillation range 260~535℃, specific gravity D 15..6 0.8258g / ml, sulfur content Figure 4 shown. The value of curve LCv-e is higher than that of curve LCv-a, and the peak value drops slowly, indicating that the coking of the tubes in this group is serious, so measures are taken to prolong the coking control time of tubes in group e at this stage, and at the same time reduce the gas supply volume of tubes in group a , so as not to burn excessively. After 800 minutes, the scorched state of tubes in group e tended to be the same as that of tubes in group a, and the overall scorched time for complete burnt was about 3 hours longer than the time required by the program.

[0050] Embodiment 4~embodiment 9 is the application example of the inventive method on the analog cracking furnace, and used instrument, equipment are as follows: infrared analyzer is SQ 2000A type (linearity≤±1.5%F.S); recorder is EN880 without Paper re...

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Abstract

The invention provides a method for on-line monitoring of the burning process. The method comprises opening a flow outlet hole with an inner diameter of 10-15mm at the outlet of the cracking furnace and / or the outlet pipe of the quenching boiler, connecting the outlet pipe through the hole, and the charred tail gas is introduced into the cooler, the gas flow meter and the outlet pipe through the outlet pipe. On-line monitoring equipment, wherein said on-line monitoring equipment includes gas purification equipment, infrared analyzer and data processor. The method is simple, easy to operate and can meet the needs of different ethylene plants. The information obtained through on-line monitoring can not only grasp the coking status in cracking furnace tubes and quenching boilers, but also reduce the consumption of coking gas, create conditions for energy saving and consumption reduction in ethylene plants, and realize the optimization of coking operations.

Description

technical field [0001] The invention relates to an online monitoring and controlling method. Background technique [0002] In the process of thermal cracking of hydrocarbons to produce olefins such as ethylene and propylene, coke will inevitably be formed in the cracking furnace tube and its quench boiler and other process parts, and the coke will be deposited on the inner wall of the cracking furnace tube and the heat exchange tube of the quench boiler , not only hinder the heat transfer of the cracking furnace tube and the quenching boiler, increase the pressure drop of the furnace tube, but also block the pipeline and affect the normal operation of the cracking furnace. Therefore, the factory must regularly clean the cracking furnace and quenching boiler and other supporting equipment. carbon treatment. The removal of carbon by combustion is called "scorching", and the control of the charring process directly affects the efficiency of the cracking furnace and the overall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G9/16
Inventor 付晓阳茅文星王红霞王国清司宇辰王永春
Owner CHINA PETROLEUM & CHEM CORP